Swapping Image Url

[Guadala Harry]

In an aspx page I have declared an Image control:
<asp:Image id="myImage" runat="server"></asp:Image>

In the code-behind I populate it's ImageURL property, like this:
myImage.ImageUrl = "some.gif";

Then, in client-side JavaScript, the user can cause the image to be
replaced, like this:
document.all("myImage").src = "other.gif";

Here's the problem: on postback, the image control's .ImageUrl property
still contains "some.gif" and not "other.gif" as I am needing.

What do I need to do to receive - during postback - the value set in the
client by the JavaScript?

Thanks!

 

[Guest]

After postback, the value of ImageUrl is coming from the control's ViewState.

One solution would be to set the value of a hidden field when you set the
image's src attribute. The value of the hidden field will get posted back
correctly.

 

[Guadala Harry]

Thanks - I thought about going the hidden field route - but was hoping for
some solution that wouldn't require adding another field or control that
needs synchronizing with the original Image control.

Any other ideas?

Thanks again...

-G

 

[Toby Mathews]

Can you make the code in your codebehind only execute the first time it
executes? i.e.

if (!Page.IsPostback)
myImage.ImageUrl = "some.gif";

Toby Mathews

 

[Guadala Harry]

That's not really relevant to the problem - it would be IF there was an
issue with postback processing walking on the value set in the client - but
issue is that the value set in the client code is never making it to the
server (unless I explicitly stuff the value into a hidden field - which I
don't want to do unless I really must).

Thanks anyway.

 

[Toby Mathews]

Harry,

Sorry, I didn't read your message properly first time round. I'm not sure
how else you could achieve what you want to do other than how you decribe.
Good luck,

Toby